I have a small server with a single NIC that I am trying to get a bridge functioning on so that I can run KVM. On this NIC I have a couple IPs statically assigned to it:

eth0 = 192.168.1.1
eth0:1 = 192.168.1.2
eth0:2 = 192.168.1.3
eth0:3 -> Assign the bridge to this

I am attempting to set up a bridge using the following instructions:

sudo brctl addbr br0
sudo brctl addif br0 eth0:3
sudo ifconfig br0 192.168.1.120 netmask 255.255.255.0 up
sudo route add -net 192.168.1.0 netmask 255.255.255.0 br0
sudo route add default gw 192.168.1.1 br0
sudo tunctl -b -u root -t tap0 > /dev/null
sudo ifconfig tap0 up
sudo brctl addif br0 tap0

However, when I do the second command:

sudo brctl addif br0 eth0:3

It puts the ENTIRE eth0 device into promiscuous mode. This knocks the server offline and inaccessible by anything other than locally.

Is there a way to bridge JUST eth0:3 to br0 and not put the entire device into promiscuous mode?